Enter distance and time to calculate pace.
Enter a completed distance to predict the time to complete a further distance.
Predict whether you will qualify for the Boston Marathon (2014 qualifying times)
Runners Calc calculates:
-Your Pace
-Predicts how long a longer distance will be based on a distance you already know you can complete
-Calculates, based off of age and sex, whether you will qualify for the Boston Marathon (using 2014 qualifying times)
This calculator is extremely lightweight and will run fast and smooth on the old iPhone 3GS.
The formula Runners Calc uses to predict how fast you will complete a run was originally devised by Pete Riegel, a research engineer and marathoner, and published in Runners World. It is a very accurate formula for predicting how fast you will run, but it is only that, a prediction.